Abstract: A cathode oxygen depletion (COD) control method is provided. The method includes determining whether a COD heater operates and calculating power generation and power consumption when the COD heater operates. Additionally, the power consumption is adjusted by comparing the calculated power generation and power consumption.

Abstract: A method for controlling an operation of a fuel cell of a fuel cell vehicle is provided. The method includes detecting a state of charge (SOC) of a high voltage battery and determining whether the detected SOC of the high voltage battery is within or beyond a preset range from a minimum recommended SOC to a maximum recommended SOC. Power generation of the fuel cell is performed or stopped by comparing a required current of the vehicle with a preset current value required to enter a fuel-cell stop mode in which the power generation of the fuel cell is stopped and a preset current value required to release the fuel-cell stop mode.

Abstract: A current limiting method of a fuel cell stack is capable of preventing current of the fuel cell stack from rapidly dropping to prevent jerking or shock from occurring while a vehicle travels. The method includes: determining whether performance deterioration of a unit cell of the fuel cell stack has occurred, employing a feed forward control type current limiting logic of the fuel cell stack before an output of the fuel cell vehicle is lowered, decreasing the current of the fuel cell stack to a predetermined level by the feed forward control type current limiting logic, and gradually restoring the current of the fuel cell stack to a maximum current usage value from a point in time when the current of a load is used.

Abstract: A system for measuring a stack cell voltage of a fuel cell according to the present invention comprises: a stack voltage measuring unit which measures a stack voltage of a stack cell battery for each channel; a correction variable calculating unit which calculates a correction variable by using the stack voltage value measured by the stack voltage measuring unit; and a stack voltage value correcting unit which corrects the stack voltage measured by the stack voltage measuring unit on driving by using the correction variable.

Abstract: Disclosed are a method and a system for controlling an output current of a fuel cell stack. The method of controlling the output current of the fuel cell stack, whereby the output current is controlled by using a data map configured with a limited output current according to a temperature of a fuel cell coolant, includes: deriving an average cell voltage value and a minimum cell voltage value of a plurality of cells constituting the fuel cell stack; correcting the data map by using the derived average cell voltage value and the derived minimum cell voltage value; and limiting the output current of the fuel cell according to the corrected data map.

Abstract: A pressure control system of a fuel cell stack includes: an air supply control unit for controlling a revolutions per minute (RPM) of an air compressor for supplying air to a cathode side of the fuel cell stack based on a required output of the fuel cell stack; a hydrogen supply control unit for controlling a pressure at an anode side of the fuel cell stack with a target pressure based on the required output of the fuel cell stack; and a differential pressure control unit for controlling the air supply control unit or the hydrogen supply control unit to calculate a differential pressure between the anode side and the cathode side of the fuel cell stack, and to modify the target pressure or the RPM of the air compressor based on the calculated differential pressure.

Abstract: An air supply control method of a fuel cell controls an amount of air supplied to the fuel cell according to an output of power required to be generated by the fuel cell. The method includes steps of: monitoring a charging level of a power storage device that stores power output from the fuel cell; modifying the amount of air supplied to the fuel cell on the basis of the monitored charging level of the power storage device; and controlling an air supply system that supplies air to the fuel cell on the basis of the modified amount of air supplied.

Abstract: A cathode oxygen depletion (COD) control method is provided. The method includes determining whether a COD heater operates and calculating power generation and power consumption when the COD heater operates. Additionally, the power consumption is adjusted by comparing the calculated power generation and power consumption.

Abstract: Disclosed are a method and a system for controlling an output current of a fuel cell stack. The method of controlling the output current of the fuel cell stack, whereby the output current is controlled by using a data map configured with a limited output current according to a temperature of a fuel cell coolant, includes: deriving an average cell voltage value and a minimum cell voltage value of a plurality of cells constituting the fuel cell stack; correcting the data map by using the derived average cell voltage value and the derived minimum cell voltage value; and limiting the output current of the fuel cell according to the corrected data map.

Abstract: A stereoscopic imaging device including: a body having a stereoscopic image display window for providing a stereoscopic image; an image combining panel which divides an inner space of the body into a first space for providing a virtual image, and a second space for providing a real image, on the stereoscopic image display window, transparency of the image combining panel being changed by input of a power; a first display which is positioned in the first space to provide the virtual image on the stereoscopic image display window through the image combining panel; a target mechanism which is positioned in the second space to provide the real image on the stereoscopic image display window through the image combining panel; an illumination mechanism which is positioned in the second space to illuminate a beam of light onto the target mechanism; and a control unit for controlling the respective units.

Abstract: The present invention relates to an air conditioning device, and the purpose of the present invention is to provide an air conditioning device having a high thermal efficiency by filling a water tank with water and allowing air passing through a dry filter to flow into the water so as to secondarily filter the air, and by directly heating or cooling the water of the water tank. Thus, the present invention comprises: an air-blower fan for sucking outside air so as to discharge the outside air with pressure; a dry filter for primarily filtering and discharging the air discharged from the air-blower fan; and a water tank which accommodates water therein and receives the air passing through the dry filter in the water so as to secondarily filter the air by contacting the water, and which discharges, indoors, the air that rises up by passing through the water, wherein the inside of the water tank is provided with a heater for heating the water and a cooling coil for cooling the water.

Abstract: A system for measuring a stack cell voltage of a fuel cell according to the present invention comprises: a stack voltage measuring unit which measures a stack voltage of a stack cell battery for each channel; a correction variable calculating unit which calculates a correction variable by using the stack voltage value measured by the stack voltage measuring unit; and a stack voltage value correcting unit which corrects the stack voltage measured by the stack voltage measuring unit on driving by using the correction variable.

Abstract: A stereoscopic imaging device including: a body having a stereoscopic image display window for providing a stereoscopic image; an image combining panel which divides an inner space of the body into a first space for providing a virtual image, and a second space for providing a real image, on the stereoscopic image display window, transparency of the image combining panel being changed by input of a power; a first display which is positioned in the first space to provide the virtual image on the stereoscopic image display window through the image combining panel; a target mechanism which is positioned in the second space to provide the real image on the stereoscopic image display window through the image combining panel; an illumination mechanism which is positioned in the second space to illuminate a beam of light onto the target mechanism; and a control unit for controlling the respective units.

Abstract: A cooling pump driving system includes an electric water pump in a coolant passage line for circulating a coolant and having a variable rotation speed. A sensor disposed at an outlet side of the electric water pump checks a coolant pressure passing through the electric water pump. A controller including a reference value for the pressure change is configured to decrease a rotation speed of the electric water pump when the pressure change detected by the sensor is the reference value or higher.

Abstract: The present invention provides a fuel cell vehicle, particularly a fuel cell vehicle equipped with a moisture remover that removes moisture from an air conditioner evaporator. The fuel cell vehicle includes: a fuel cell stack as a power supplier; an electric heater operated by power from the fuel cell stack; a blower fan for providing air to the electric heater; an air channel configured to supply the air passing through the electric heater to an air conditioner evaporator; and a controller for controlling the operations of the electric heater and the blower fan, whereby moisture is removed from the air conditioner evaporator by supplying air heated by the electric heater to the air conditioner evaporator. The fuel cell vehicle effectively removes moisture from an air conditioner evaporator, solves the problem of a bad smell in the related art, and further removes the oxygen and the stack voltage which remain in the cathode, such that it is possible to avoid cathode oxygen depletion of the related art.

Abstract: Disclosed herein is an electric generating system using a solar cell which converts a voltage generated in the solar cell into an Alternating Current (AC) voltage, and applies the converted voltage to a power system. The electric generating system includes; a Direct Current (DC)/DC converter that converts the voltage generated in the solar cell into a DC voltage, and has a synchronous rectifier including a synchronous switch; and a controller that detects one of a phase and a voltage of the power system, and selectively connects the synchronous switch of the synchronous rectifier in accordance with one of the phase and voltage of the power system. Here, the electric generating system reduces a conduction loss, and increases overall efficiency of the electric generation system.

Abstract: The present invention provides a method of reducing greenhouse gases by capturing and storing carbon dioxide in the form of a biomass, which may be converted into a high value material such as, for example, an oil having more than 37% of omega-3, biodiesel, phospholipid, glycerin, glucose, and a protein feed.

Abstract: The present invention provides an improved fuel efficiency measuring system for a fuel cell vehicle which simplifies various valves and hydrogen lines and modulizes its individual elements. More specifically, the present invention provides an improved fuel efficiency measuring system for a fuel cell vehicle that eliminates a purging hydrogen tank previously used for removing residual air in a hydrogen supply line and instead removes residual air in a hydrogen supply line by using a vehicle side hydrogen tank. Additionally, the present invention simplifies couplers installed in a hydrogen supply line, and considerably reduces manufacturing costs by eliminating a high-cost break-away coupler adapted to couple a fuel efficiency measuring unit and the vehicle side.

Abstract: Disclosed herein is an electric generating system using a solar cell which converts a voltage generated in the solar cell into an Alternating Current (AC) voltage, and applies the converted voltage to a power system. The electric generating system includes; a Direct Current (DC)/DC converter that converts the voltage generated in the solar cell into a DC voltage, and has a synchronous rectifier including a synchronous switch; and a controller that detects one of a phase and a voltage of the power system, and selectively connects the synchronous switch of the synchronous rectifier in accordance with one of the phase and voltage of the power system. Here, the electric generating system reduces a conduction loss, and increases overall efficiency of the electric generation system.

Abstract: The present invention provides a fuel cell vehicle, particularly a fuel cell vehicle equipped with a moisture remover that removes moisture from an air conditioner evaporator. The fuel cell vehicle includes: a fuel cell stack as a power supplier; an electric heater operated by power from the fuel cell stack; a blower fan for providing air to the electric heater; an air channel configured to supply the air passing through the electric heater to an air conditioner evaporator; and a controller for controlling the operations of the electric heater and the blower fan, whereby moisture is removed from the air conditioner evaporator by supplying air heated by the electric heater to the air conditioner evaporator. The fuel cell vehicle effectively removes moisture from an air conditioner evaporator, solves the problem of a bad smell in the related art, and further removes the oxygen and the stack voltage which remain in the cathode, such that it is possible to avoid cathode oxygen depletion of the related art.